Cast
- Tim Treloar (The Doctor)
- Katy Manning (Jo Jones (Jo Grant))
- Chris Larkin (Arthur Pepperdine)
- Emily Joyce (Lucy Pepperdine)
- Felicity Cant (Emmeline Pepperdine)
- Gary Turner (Drexel)
- Nicholas Briggs (The Cybermen)
Doctor Who - The Third Doctor Adventures
Doctor Who: The Third Doctor Adventures: The Quintessence
Written by Stewart Pringle Lauren Mooney
Starring Tim Treloar Katy Manning
